Exactly that commit (was Re: Latest -current 100% hang at the late boot stage)

[Kostik Belousov]

On Mon, Jun 20, 2011 at 11:02:22AM +0400, Andrey Chernov wrote:
> On Sun, Jun 19, 2011 at 08:15:43PM -0600, Justin T. Gibbs wrote:
> > On 6/19/11 6:19 PM, Andrey Chernov wrote:
> > > Exactly that commit is responsible for boot hang.
> > > Please fix.
> > > BTW, I have MBR on SATA disk (CAM emulated), ICH9.
> > 
> > Since it works for me, you'll need to provide more information.  Can you
> > at least drop into kdb to determine the likely source of the hang by
> > getting a stack trace of all processes to see where they are sleeping
> > and dumping lock information?
> 
> I drop into DDB and put 'bt' console photo in the very first message of 
> this thread - nothing unusual seen in the main stack. Could you please 
> specify exact DDB commands you want to be issued by me? No dump can be 
> provided since nothing is mounted yet including swap,
> 
> BTW, I remember I saw previously unseen warnings with post Jun 14 kernels:
> "xpt_action_default: CCB type 0xe not supported"
> 
> 'ps' inside DDB shows [xpt_thrd] at "ccb_scan" wmesg state and [g_event]
> at "caplck" wmesg state, [kernel] at "g_waitid" state.
> Even don't know, if it matters.

Just in case, please try r223277.
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